<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="jquery-1.12.2.js"></script>
    <script>
        $(function(){
           $("#btn").click(function () {
               $(this).val("哇啦啦，哇卡啦");
           }).mouseover(function () {
               $(this).css({
                   "width":"200px",
                   "height":"100px"
               });
           }).mouseout(function () {
               $(this).css("backgroundColor","green");
           })
        });
    </script>
</head>
<body>
<input type="button" value="显示效果" id="btn"/>
</body>
</html>